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Health Measurement ScalesA practical guide to their development and use$
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David L. Streiner and Geoffrey R. Norman

Print publication date: 2008

Print ISBN-13: 9780199231881

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199231881.001.0001

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Selecting the items

Selecting the items

(p.77) Chapter 5 Selecting the items
Health Measurement Scales

David L. Streiner

Geoffrey R. Norman

Oxford University Press

Not all items will work as intended. This chapter discusses various criteria that should be used to decide whether an item can be retained or should be eliminated. These include issues that affect the understanding of items, such as reading level, ambiguity, wording, and face validity as well as statistical criteria, such as frequency of endorsement and the internal consistency of the scale.

Keywords:   internal consistency, homogeneity, Cronbach's alpha, KR-20, ambiguity, reading level, face validity

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